Density measurement of liquid indium and zinc by the γ-ray attenuation method

A γ-ray attenuation densitometer was set up to determine the density of pure liquid indium and zinc from the melting point to ∼ 800 °C. The melting-point density of pure liquid indium and pure liquid zinc were found to be 7.10 g cm -3 and 6.63 g cm -3 , respectively. The temperature dependence of the density was ρ In /g cm -3 = 7.22 - 10.7 x 10 -4 (t/°C) + 2.94 ×10 -7 (t/°C) 2 for liquid indium and ρ Zn /g cm -3 = 7.15 - 15.9 × 10 -4 (t/°C) + 5.69 x 10 -7 (t/°C) 2 for liquid zinc, from melting temperature to 800 °C.